Pittsburgh Corning has redesigned its LightWise glass block windows to include new features for easier, hassle-free installation. While still featuring the beauty and durability of real glass, all sizes of the new window are 20 percent lighter than the original LightWise Window. New features include a 2-in. glass block instead of 3 in.; setback nailing fins for use with stucco and other standard finishes; and a flat face design to create a tighter perimeter seal that is easier to clean.